Redirecting subdomains to external websites

Hopefully this is a simple problem. We are attemping to use ISPConfig to combine all our different services into one Control Panel. The last piece is our DNS provider allows us to setup forwards by creating dns entries like:

From what I have seen we should be able to mimic the same functionality by creating a subdomain under the websites and redirecting it to an external site. So I setup a subdomain and set the redirection to the site but it just keeps showing the same homepage for the main domain. I have tried the different flags and confirmed the changes are being made in the vhost.

Is there anything else I should look at or try to see why this isn't working?

Hopefully this is a simple problem. We are attemping to use ISPConfig to combine all our different services into one Control Panel. The last piece is our DNS provider allows us to setup forwards by creating dns entries like:

From what I have seen we should be able to mimic the same functionality by creating a subdomain under the websites and redirecting it to an external site. So I setup a subdomain and set the redirection to the site but it just keeps showing the same homepage for the main domain. I have tried the different flags and confirmed the changes are being made in the vhost.

Is there anything else I should look at or try to see why this isn't working?

Thanks

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This should work by creating a subdomain.

1) Create a dns a-record for webmail.domain.tld pointing to the same IP address the the website where you want to create the subdomain.
2) Add a subdomain webmail.domain.tld and select as redirect type "No Flag" and enter as redirect path "http://owa.somedomain.com/".